With the performance work those around me have done,and I've done,to late model Fords it seems the engines hold up well to the normal tuning type mods that add 100 or so HP and they still are not tempermental in traffic.
Even if the plan is to race on the weekends out of town,driving the car,most of what breaks is the same FE or Mod.Clutch,rear,u joint. With an FE add rockers,shafts,cam going flat,water pump,rear main leak,fuel pump...and the fact even the gaskets are not stocking parts at most parts stores. Unless you happened to get a bad one the new mods will go 100,000 miles with just an oil change!(but change the plus if you race it)
But they still don't fit our old shock tower Fords. 

Well they do say we don't "drive"dyno's.

I can't really say what I lost or gained,other than that very low rpm cruise, if it's "gathering up it's skirt" below 3000rpm I can't tell, it still blows the rear tires loose in third gear at the magic 3000rpm(and below). Matter of fact it spins the tires after the 3-4 shift too........oh yea....... .

Thanks allot Jay.
I went to our local once a year "good swapmeet nobody knows about"
SM with a worn out 600 Holley $200!

But I did sell one for $150.

Do I have to send you a cut? I bought a book,will that cover it?

BTW I swapped from a SM to RPM the low end carb tuning and cruise,2000rpm ish,became much less touchy and the mixture became more stable according to my LC1 O2 indicator...

The car is cool,really what most of us would want as the GT.
The engine is the star though,the rest of the car is just a well tuned Mustang.
I've been saying lately that if the new 5.0 crate motor came out or was even leaked before I dropped the near $8k in my FE and install I would have notched the shock towers in my Mustang to install it instead.
I love my FE but I know I would drive the car much more if I got double digit gas mileage...